47-55.1 54 Chev front fender alignment

[DFC95]

My appologies if this has been covered before. I couldn't find the info doing a search.
I'm trying to align my 54 front fenders. On the cab there is a recessed area that has the holes to bolt the fenders to the cab. Does the outer edge of the fender fit into this area on the cab or does the fender mounting surface to the cab sit on top of this recessed area?

Hope this makes sense

Thanks for any help.

Jeff